I have edited qweb report templates , after saving, i refreshed page and got 404 error in popup window. I had this error earlier, and solve it with logout / login. I logged out, and after log in, it shows only favicon of our company , and nothing more.I tried different browsers (google chrome, opera, internet explorer), clear history (cache and etc.), have tried to login with all available users for login,also i deleted sessions files on odoo server (in debian it was in /var/lib/odoo/.local/share/Odoo/sessions ), restarted postgresql and odoo several times, log in from 4 different machines - nothing helps.Most strange thing, that i can login in different database, or create new database, and don't have any problem at all. But when i copy my database in database manager, and login in copy, i have same problem - blank page.There was session on other host while i'm working, and it seems , now only from these computer we can login in that database with no issues.Also , i have those error in browser console:

After login, i had redirected to this page:
http://my.host:8069/web
Normally , after this, it redirect to page like this
http://my.host:8069/web#menu_id=96&action=92&active_id=channel_inbox
But this not happens.
I tried to paste it manually, but this doesn't help.